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以工程地质条件详细调查为基础,采用宏观地质分析与极限平衡法、数值模拟法相结合的研究手段,分层次对乌东德水电站右岸引水洞进口边坡整体稳定和局部稳定性进行了系统研究。结果表明:乌东德水电站右岸引水洞进口边坡整体稳定性较好,三维离散元数值模拟结果显示,人工边坡变形以少量回弹变形为主,变形特征不突出。在分析边坡开挖后可能形成的块体边界条件基础上,提出了人工边坡可能出现的块体失稳模式,从块体稳定性影响因素分析入手,建立块体稳定性工程地质评价标准,对块体稳定性进行了宏观地质分析,并采用三维刚体极限平衡方法对可能产生的块体模型进行了计算分析,得到块体开挖后的稳定系数。结果表明,人工边坡可能出现的块体多处于基本稳定状态。综合整体稳定性和局部稳定性研究成果,提出人工边坡加固方案建议。研究成果为工程设计与施工可提供重要依据,并对类似工程提供可以借鉴的经验。
Based on the detailed investigation of engineering geological conditions, this paper systematically studied the overall stability and local stability of inlet slope of water diversion tunnel at right bank of Wudongde Hydropower Station by using the research methods of macroscopic geologic analysis, limit equilibrium method and numerical simulation method. The results show that the overall stability of inlet slope of right bank diversion tunnel of Wudongde hydropower station is good. The numerical simulation results of three-dimensional discrete element show that the deformation of artificial slope is dominated by a small amount of springback and the deformation characteristics are not prominent. Based on the analysis of the block boundary conditions that may be formed after the excavation of the slope, the possible block instability model of the artificial slope is proposed. Starting from the analysis of the influencing factors of the block stability, the engineering standard of block stability assessment , The macroscopic geological analysis of block stability was carried out, and the possible block model was calculated and analyzed by using the limit equilibrium method of three-dimensional rigid body. The stability coefficient after block excavation was obtained. The results show that the blocks that may appear on the artificial slope are mostly in a basically steady state. Based on the research results of overall stability and local stability, the proposal of artificial slope reinforcement plan is put forward. The research results provide an important basis for engineering design and construction and provide similar experiences for similar projects.